JAVA: Count the number of instances of substring within a string without using subString function

package PACKAGE1;

import java.io.*;

public class subStringCheck {
 static String strng;
 static char st[];

 public static void main(String args[]) throws IOException {
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  System.out.println("Enter the String");
  strng = br.readLine();
  st = strng.toCharArray();
  subStringCheck obj = new subStringCheck();
  System.out.println("Enter the sub string");
  obj.substring(br.readLine());
 }

 public void substring(String str) {
  char[] s1 = str.toCharArray();
  int length = str.length();
  int i = -1;
  int count = 0;
  int noOfTimes = 0;
  boolean repeated = false;

  while (i < (strng.length() - 1)) {
   for (int s = 0; s < str.length(); s++) {
    i++;
    if (st[i] == s1[s]) {
     count++;

     if (count == length) {
      noOfTimes++;
      repeated = true;
      break;
     }
    } else {

     count = 0;
     break;

    }

   }

  }

  if (repeated == true) {
   System.out.println("The substring has repeated " + noOfTimes
     + " times");
  } else {

   System.out.println("Theere is no substring");
  }
 }

}